Remove outdated examples

[odow]

Closes #203. The examples are out-of-date.

[codecov-io]

Codecov Report

Merging #262 into master will decrease coverage by 0.04%.
The diff coverage is n/a.

@@            Coverage Diff            @@
##           master    #262      +/-   ##
=========================================
- Coverage   69.24%   69.2%   -0.05%     
=========================================
  Files          15      15              
  Lines        2432    2432              
=========================================
- Hits         1684    1683       -1     
- Misses        748     749       +1

Impacted Files	Coverage Δ
src/cpx_env.jl	84.61% <0%> (-2.57%)	⬇️

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